#include <iostream>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char** argv) {
	int i,sum;
	sum=0;
	for(int i=1;i<=100;i=i+2){
		sum=sum+i;
				
}

printf("%d",sum);
	return 0;
}
